It's funny because I notice that, while spending time online browsing BF or Flickr, I tend to obsess about making another bike purchase. I would love to get some sort of a Rivendell or Waterford single-speed commuter bike with braze ons, accommodations for fat tires, and high handle bars. But when I actually ride my bike, I usually tend to think that it has fantastic ride characteristics. I also tend to question my desires for wanting a new bike.
I voted that I am satisfied with my current commuter because it's dialed in perfectly. It currently has 32mm tires, a comfy saddle, and a smart drivetrain that works well with the hills in my commute.